1. ## Port Area/Box for 18" BTL

Gonna build a ported box for a new 18" BTL and need to know how much port area to feed it.

I have about 13 cubes to work with so any airspace reccomendations would be great too, daily driver. thanks

2. ## Re: Port Area/Box for 18" BTL

14-16 inches per cubic foot. Something like this should workout. You might want
to double face it.

3. ## Re: Port Area/Box for 18" BTL

If i do two seperate ports the combined area comes out to around 123 in w/ each port being 20.5x3. should be enough?

4. ## Re: Port Area/Box for 18" BTL

Originally Posted by MisterE
If i do two seperate ports the combined area comes out to around 123 in w/ each port being 20.5x3. should be enough?
That's great, as long as you do the math to determine the depth of the
ports given you box's net cubic feet and tune.

5. ## Re: Port Area/Box for 18" BTL

Oh forgot to thank you, even though I didnt use your plan.

Doing 123 sq in port area, box is about 7.9 cu ft. its huuuuuuge

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